| 裴晓平,马占伟,宋承立,熊绪茂,胡斌.Ru和Ce0.8Pr0.2O2载体之间界面调控对氨合成催化剂活性的影响[J].分子催化,2018,32(3):195-204 |
| Ru和Ce0.8Pr0.2O2载体之间界面调控对氨合成催化剂活性的影响 |
| Effect of Interface Regulation Between Ru and the Ce0.8Pr0.2O2 Support on the Activity of Ammonia Synthesis |
| 投稿时间：2018-03-14 修订日期：2018-04-18 |
| DOI： |
| 中文关键词: 稀土氧化物 氨合成 多相催化 晶面效应 钌基催化剂 |
| 英文关键词:rare earth oxides ammonia synthesis heterogeneous catalysis plane effect Ru-based catalyst |
| 基金项目:This work is supported by the National Natural Science Foundation of China (Grant No. 21403257). |
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| 中文摘要: |
| 我们报道了稀土离子掺杂进CeO2的形貌和不同晶面对氨合成活性的影响.我们采用了将Pr掺杂到CeO2的晶格里，制备成不同形貌的Ce0.8Pr0.2O2载体（棒状，立方块）.实验表明，在400℃，1 MPa下，Ru/r-Ce0.8Pr0.2O2催化剂的氨合成催化活性（2 297.09 umol/（g·h））比Ru/c-Ce0.8Pr0.2O2催化剂的氨合成活性（887.57 umol/（g·h））要高.另外我们发现Cs可以有效的促进氨合成催化剂的活性，如2Cs-Ru/r-Ce0.8Pr0.2O2（13 698 μmol/（g·h）），2Cs-Ru/c-Ce0.8Pr0.2O2（（7 667.7μmol/（g·h））.从本研究可以看出，催化剂的催化活性与载体所暴露的不同晶面有关. |
| 英文摘要: |
| Two Pr-doped ceria nanocrystals with different morphologies (nanocubes and nanorods) were synthesized and used as supports to evaluate the effect of the interface regulation by Pr ions on the structure-sensitive ammonia synthesis reaction activity. The Ru/r-Ce0.8Pr0.2O2 has a higher activity (2 297.1 μmol/(g·h)) than that of Ru/c-Ce0.8Pr0.2O2(887.6 μmol/(g·h)) under the reaction condition of 400℃ and 1 MPa. In addition, the promoter Cs can effectively enhance the catalytic activity of catalysts such as 2Cs-Ru/r-Ce0.8Pr0.2O2 (13 698.6 μmol/(g·h)) and 2Cs-Ru/c-Ce0.8Pr0.2O2(7 667.7 μmol/(g·h)). The effect of the plane of Ce0.8Pr0.2O2 support on the catalytic performance of Ru/Ce0.8Pr0.2O2 and 2Cs-Ru/Ce0.8Pr0.2O2 catalysts could be correlated to the Pr doping into CeO2 altered the interface properties (composition and electron structure) between the Ru nanoparticles and the Ce0.8Pr0.2O2 support. |
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